PowerBoss Nautilus Hi-Dump PB45HDSL, Service Booklet

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NAUTILUS HYDRAULIC MANIFOLD OPERATION
MAIN HYDRAULIC MANIFOLD
The main hydraulic manifold performs the following functions:
Main brush system pressure relief
Main brushes on and off
Scrub head raise and lower
Scrub head lock in the raised position
Main brush scrubbing force
Squeegee raise and lower
Squeegee lock in the raised position
Location and operation of the individual main scrub brush hydraulic valves:
The following six (of ten) solenoid valves that control main brush functions receive hydraulic pressure
and flow from the front auxiliary pump which has a displacement of .84 cu. In./rev. and supplies a
nominal flow of 8.7 gpm.
Hydraulic fluid controlled by the following six main brush system valves enters the manifold through
port P2.
PRESSURE RELIEF VALVE RV2 in port 9.1 provides pressure relief. This valve allows a maximum system
pressure of 2500 psi.
This valve dumps to tank through port T2
SOLENOID VALVE SV2 (All off) in port 7.1 is a 2-position 2-way normally-open control valve.
When de-energized this valve opens a direct path from the pressurized side of the manifold to tank.
When energized this solenoid closes the direct path from the pressurized side of the manifold to tank.
This valve opens to tank through port T2
CHECK VALVE CV1 in port 8 prevents the main brushes from rotating due to system back pressure when
the brushes are turned off.
SOLENOID VALVE SV3 (Main brushes on-off) in port 3.2 is a 2-position 2-way normally-closed control
valve.
When de-energized this valve prevents flow to the main brush motors.
When energized this solenoid opens and provides pressurized flow to the main brush motors.
This valve directs the fluid flow to the motors through port MB-OUT
PROPORTIONAL REDUCTION VALVE SV4 (Main brush force) in port 6.1.
This valve controls main brush scrubbing force (against the floor) by regulating the fluid pressure to the
rod-end of the scrub head lift cylinder.
SOLENOID VALVE SV5 (Main brushes down) in port 5.1 is a 2-position 3-way directional control valve.